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Deep Vein Thrombosis: Causes, Symptoms & Treatment

Deep vein thrombosis (DVT) occurs when a blood clot forms in a deep vein of the leg. It can lead to serious complications such as pulmonary embolism if left untreated.

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Things worth knowing about "Deep Vein Thrombosis"

Deep vein thrombosis (DVT) occurs when a blood clot forms in a deep vein of the leg. It can lead to serious complications such as pulmonary embolism if left untreated.

What is Deep Vein Thrombosis?

Deep vein thrombosis (DVT) is a condition in which a blood clot (thrombus) forms in one of the deep veins of the leg, most commonly in the calf, thigh, or pelvis. The clot can partially or completely block blood flow through the vein. A potentially life-threatening complication occurs when the clot breaks loose and travels through the bloodstream to the lungs, causing a pulmonary embolism.

Causes

The development of DVT is associated with three main contributing factors, known as the Virchow Triad:

Slowed blood flow: Prolonged sitting (e.g., during long flights or desk work), bed rest, or immobility reduces the speed of venous blood flow.
Vessel wall damage: Injury or inflammation of the vein wall promotes clot formation.
Increased blood clotting tendency: Inherited clotting disorders (e.g., Factor V Leiden mutation), use of oral contraceptives, pregnancy, or certain cancers increase the risk of clotting.

Additional risk factors include obesity, advanced age, a personal history of thrombosis, and major surgeries, particularly hip or knee replacements.

Symptoms

Symptoms of DVT can vary in severity. Common signs include:

Swelling of the affected leg, usually on one side only
Pain or a feeling of tightness in the calf or thigh
Redness and warmth of the skin over the affected vein
Bluish discoloration (cyanosis) of the skin in severe cases

Note: DVT can sometimes occur without any noticeable symptoms, making diagnosis more challenging.

Diagnosis

Several methods are used to diagnose DVT:

Clinical assessment: Physicians evaluate swelling, pain, and skin changes using standardized scoring tools such as the Wells Score.
D-dimer blood test: Measures breakdown products of blood clots. A negative result can largely rule out DVT.
Duplex ultrasound: An ultrasound examination that visualizes blood flow and can directly detect clots in the veins. This is the primary imaging method used.
Phlebography: An X-ray using contrast dye; less commonly used today but helpful in ambiguous cases.
MRI or CT scan: Used particularly when pelvic or abdominal vein thrombosis is suspected.

Treatment

The goals of treatment are to prevent clot growth, reduce the risk of pulmonary embolism, and minimize long-term complications.

Anticoagulation Therapy

Anticoagulants (blood thinners) are the cornerstone of DVT treatment:

Direct oral anticoagulants (DOACs): Medications such as rivaroxaban or apixaban are now the first-line treatment. They directly inhibit clotting factors and are taken orally.
Heparin: Often used at the start of treatment, administered by injection, for rapid anticoagulation.
Vitamin K antagonists (e.g., warfarin): Older anticoagulants that require regular blood monitoring to maintain therapeutic levels.

Compression Therapy

Wearing compression stockings supports venous return, reduces swelling, and may lower the risk of post-thrombotic syndrome, a long-term complication of DVT.

Thrombolysis and Surgical Options

In severe or extensive cases, thrombolysis (using medication to dissolve the clot) or surgical removal of the clot (thrombectomy) may be required.

Prevention

Key preventive measures for DVT include:

Regular physical activity and avoiding prolonged periods of sitting
Adequate hydration
Wearing compression stockings during long-haul travel
Pharmacological thrombosis prophylaxis after surgery or during extended hospital stays
Weight management in cases of obesity

References

Deutsche Gesellschaft für Angiologie (DGA) - Guidelines for the Diagnosis and Treatment of Venous Thrombosis and Pulmonary Embolism (2023).
Konstantinides S. et al. - 2019 ESC Guidelines for the diagnosis and management of acute pulmonary embolism. European Heart Journal, 2020.
Kyrle P.A., Eichinger S. - Deep vein thrombosis. The Lancet, 2005; 365(9465): 1163-1174.

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